$(function() {  
    /*  在textarea处插入文本--Start */  
    (function($) {  
        $.fn  
                .extend({  
                    insertContent : function(myValue, t) {  
                        var $t = $(this)[0];  
                        if (document.selection) { // ie  
                            this.focus();  
                            var sel = document.selection.createRange();  
                            sel.text = myValue;  
                            this.focus();  
                            sel.moveStart('character', -l);  
                            var wee = sel.text.length;  
                            if (arguments.length == 2) {  
                                var l = $t.value.length;  
                                sel.moveEnd("character", wee + t);  
                                t <= 0 ? sel.moveStart("character", wee - 2 * t  
                                        - myValue.length) : sel.moveStart(  
                                        "character", wee - t - myValue.length);  
                                sel.select();  
                            }  
                        } else if ($t.selectionStart  
                                || $t.selectionStart == '0') {  
                            var startPos = $t.selectionStart;  
                            var endPos = $t.selectionEnd;  
                            var scrollTop = $t.scrollTop;  
                            $t.value = $t.value.substring(0, startPos)  
                                    + myValue  
                                    + $t.value.substring(endPos,  
                                            $t.value.length);  
                            this.focus();  
                            $t.selectionStart = startPos + myValue.length;  
                            $t.selectionEnd = startPos + myValue.length;  
                            $t.scrollTop = scrollTop;  
                            if (arguments.length == 2) {  
                                $t.setSelectionRange(startPos - t,  
                                        $t.selectionEnd + t);  
                                this.focus();  
                            }  
                        } else {  
                            this.value += myValue;  
                            this.focus();  
                        }  
                    }  
                })  
    })(jQuery);  
    /* 在textarea处插入文本--Ending */  
});
